var fs=require("fs");
var data='';

//创建可读流

var readerStream=fs.createReadStream('data/input.txt');

//设置编码格式utf8
readerStream.setEncoding('utf8');

//处理流事件-->data end and error
readerStream.on('data',function(chunk){
    data+=chunk;
});

readerStream.on('end',function(){
    console.log(data);
});

readerStream.on('error',function(err){
console.log(err.stack);
});

console.log("程序执行完毕");